HP today announced HP iPrint Photo, a free application available on the Apple App store that gives iPhone and iPod touch customers the ability to easily print photos anytime, anywhere. Here is more info:

HP iPrint Photo is the first photo printing application of its kind and allows for quick and easy wireless printing of 4 x 6-inch photos from an iPhone or iPod touch to most HP inkjet printers connected to a local Wi-Fi network. The application is fully compatible with Apple?s Bonjour technology and uses the innovative Multi-Touch interface for the easiest and fastest wireless iPhone or iPod touch print experience.